phi-undef.ll
884 Bytes
; RUN: opt -mtriple=amdgcn-- -analyze -divergence %s | FileCheck %s
; CHECK-LABEL: 'test1':
; CHECK-NEXT: DIVERGENT: i32 %bound
; CHECK: {{^ *}}%counter =
; CHECK-NEXT: DIVERGENT: %break = icmp sge i32 %counter, %bound
; CHECK-NEXT: DIVERGENT: br i1 %break, label %footer, label %body
; CHECK: {{^ *}}%counter.next =
; CHECK: {{^ *}}%counter.footer =
; CHECK: DIVERGENT: br i1 %break, label %end, label %header
; Note: %counter is not divergent!
define amdgpu_ps void @test1(i32 %bound) {
entry:
br label %header
header:
%counter = phi i32 [ 0, %entry ], [ %counter.footer, %footer ]
%break = icmp sge i32 %counter, %bound
br i1 %break, label %footer, label %body
body:
%counter.next = add i32 %counter, 1
br label %footer
footer:
%counter.footer = phi i32 [ %counter.next, %body ], [ undef, %header ]
br i1 %break, label %end, label %header
end:
ret void
}